Question

我正在使用FindFirstChangeNotification（）/ ReadDirectoryChangesW（）来查看文件夹以进行更改。它按预期工作。我的问题是：当我尝试重命名Watched文件夹的父级时，我被拒绝访问，错误5.我猜我的FCN句柄打开了通知监视文件夹，并且不允许更改父级。

有没有办法监视一个子目录，比如c：\ folder \ subfolder \ anotherfolder \，仍然可以打开命令提示符（或其他程序）并执行“重命名c：\ folder \ c：\ folder2” “

这是我的代码段

    //
    // Sign up for notifications on the object. 
    //
    m_bWatchSubTree = TRUE;
    m_dwWatchFlags =
        FILE_NOTIFY_CHANGE_SECURITY |       // (0x100) change to security descriptor (NTFSACL?)
        FILE_NOTIFY_CHANGE_CREATION |       // (0x40) change to creation date
        FILE_NOTIFY_CHANGE_LAST_ACCESS |    // (0x20) change to last access date  
        FILE_NOTIFY_CHANGE_LAST_WRITE |     // (0x10) any change to the modification date/time of file in the folder
        FILE_NOTIFY_CHANGE_SIZE |           // (0x08) Size changed
        FILE_NOTIFY_CHANGE_ATTRIBUTES |     // (0x04) Atributes of something changed
        FILE_NOTIFY_CHANGE_DIR_NAME |       // (0x02) DIR name change in watched folder rename,create,delete FOLDER
        FILE_NOTIFY_CHANGE_FILE_NAME;       // (0x01) FILE name change in watched folder. rename,create,delete FILE

    CString strObjectPathAndName(_T("c:\\folder\\subfolder\\anotherfolder\\");
    m_hChangeHandle = ::FindFirstChangeNotification(strObjectPathAndName, m_bWatchSubTree, m_dwWatchFlags);
    if (m_hChangeHandle != INVALID_HANDLE_VALUE)
    {
        DWORD dwStatus = ::WaitForSingleObject(m_hChangeHandle, INFINITE);
        HANDLE  hDir = ::CreateFile(strObjectPathAndName, 
                                FILE_LIST_DIRECTORY,
                                FILE_SHARE_READ | FILE_SHARE_WRITE| FILE_SHARE_DELETE,
                                NULL, //security attributes
                                OPEN_EXISTING,
                                FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OVERLAPPED,          
                                NULL);
        DWORD dwBytesReturned = 0;
        FILE_NOTIFY_INFORMATION *p = (FILE_NOTIFY_INFORMATION*)nb.GetBuffer();
        if (::ReadDirectoryChangesW(hDir, p, nb.GetMaxSize(), m_bWatchSubTree, m_dwWatchFlags, &dwBytesReturned, NULL, NULL))
        {
        //
        // do some stuff
        }
    }

Answer 1

不确定这是否是您需要的，

如果您有兴趣在 c：\ folder \ subfolder \ anotherfolder \ 中维护当前监听器的同时收听其他路径，则需要一个HANDLE类型的数组。

在您的代码中，它将如下所示：

HANDLE m_hChangeHandle[x];// int x should be the quantity of your desired listeners.

当然，您需要为每个数组使用FindFirstChangeNotification，即：

m_hChangeHandle[0] = FindFirstChangeNotification(..., ..., ...);
m_hChangeHandle[1] = FindFirstChangeNotification(..., ..., ...);
//and so on..

由于您现在使用的是1个以上的监听器，因此您无法继续使用WaitForSingleObject，而是使用WaitForMultipleObjects。即：

WaitForMultipleObjects(x, m_hChangeHandle, FALSE, INFINITE);//False will wait for a change in at least one of the listeners.

希望它能满足您的需求。

FindFirstChangeNotification锁定父文件夹

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